C#에서 명령줄 인수(command line argument) 사용하기

Program.cs의 Main을 변경함

static class Program
{
    /// <summary>
    /// 해당 응용 프로그램의 주 진입점입니다.
    /// </summary>
    [STAThread]
    static void Main(string[] args)
    {
        foreach (string arg in args)
        {
            Console.WriteLine(arg);
        }
        ....
    }
}

Parsing은  NDesk.Options (Documentation) 또는  Mono.Options을 사용하는 것이 아주 좋음

- http://www.ndesk.org/doc/ndesk-options/

- https://github.com/mono/mono/blob/master/mcs/class/Mono.Options/Mono.Options/Options.cs

bool show_help = false;
List<string> names = new List<string> ();
int repeat = 1;

var p = new OptionSet () {
    { "n|name=", "the {NAME} of someone to greet.",
       v => names.Add (v) },
    { "r|repeat=", 
       "the number of {TIMES} to repeat the greeting.\n" + 
          "this must be an integer.",
        (int v) => repeat = v },
    { "v", "increase debug message verbosity",
       v => { if (v != null) ++verbosity; } },
    { "h|help",  "show this message and exit", 
       v => show_help = v != null },
};

List<string> extra;
try {
    extra = p.Parse (args);
}
catch (OptionException e) {
    Console.Write ("greet: ");
    Console.WriteLine (e.Message);
    Console.WriteLine ("Try `greet --help' for more information.");
    return;
}

Command Line Parser Library ( http://commandline.codeplex.com/ ) 도 있음.

class Options
{
    [Option("i", "input", Required = true, HelpText = "Input file to read.")]
    public string InputFile { get; set; }

    [Option(null, "length", HelpText = "The maximum number of bytes to process.")]
    public int MaximumLenght { get; set; }

    [Option("v", null, HelpText = "Print details during execution.")]
    public bool Verbose { get; set; }

    [HelpOption(HelpText = "Display this help screen.")]
    public string GetUsage()
    {
        var usage = new StringBuilder();
        usage.AppendLine("Quickstart Application 1.0");
        usage.AppendLine("Read user manual for usage instructions...");
        return usage.ToString();
    }
}

Examples

using System;

class Program
{
    static void Main(string[] args)
    {
	if (args == null)
	{
	    Console.WriteLine("args is null"); // Check for null array
	}
	else
	{
	    Console.Write("args length is ");
	    Console.WriteLine(args.Length); // Write array length
	    for (int i = 0; i < args.Length; i++) // Loop through array
	    {
		string argument = args[i];
		Console.Write("args index ");
		Console.Write(i); // Write index
		Console.Write(" is [");
		Console.Write(argument); // Write string
		Console.WriteLine("]");
	    }
	}
	Console.ReadLine();
    }
}

==> Output

"C:\ConsoleApplication1.exe" a b c
args length is 3
args index 0 is [a]
args index 1 is [b]
args index 2 is [c]

"C:\ConsoleApplication1.exe" a                 b           c
args length is 3
args index 0 is [a]
args index 1 is [b]
args index 2 is [c]

"C:\\ConsoleApplication1.exe" http://www.dotnetperls.com/
args length is 1
args index 0 is [http://www.dotnetperls.com/]

"C:\ConsoleApplication1.exe" "Literal      test "
args length is 1
args index 0 is [Literal      test ]